Article
Energy & Fuels
Jichao Liang, Quanchang Zhang, Zheng Chen, Zunqing Zheng, Chao Yang, Qixin Ma
Summary: The use of Tetrahydrofuran (THF) and ethanol as co-solvents for diesel fuel can increase combustion efficiency and reduce emissions, especially at low EGR rates, in diesel engine tests.
Article
Thermodynamics
Jose Antonio Velez Godino, Miguel Torres Garcia, Francisco Jose Jimenez-Espadafor Aguilar
Summary: Experimental study on a compression ignition engine using late direct injection of rapeseed biodiesel fuel blends shows a significant reduction in nitrogen oxides emissions without compromising performance, indicating an advanced combustion mode between traditional compression ignition engines and homogeneous charge compression ignition combustion mode.
Article
Energy & Fuels
Changming Gong, Xiankai Si, Yang Wang, Fenghua Liu
Summary: The experimental results indicate that the addition of CO2 in the intake charge of a GDI engine has a positive effect on combustion performance and emissions compared to adding EGR, with a more significant impact at low loads.
Article
Chemistry, Physical
Masoud Karimi, Xiaolin Wang, James Hamilton, Michael Negnevitsky
Summary: Hydrogen-diesel dual fuel technology can improve the performance and reduce carbon emissions of compression ignition engines. This study explores the use of oxygen enrichment to enhance the performance of this technology at partial loads and low loads, and also implements exhaust gas recirculation for NOx emission reduction. The results show significant reductions in emissions and improvements in thermal efficiency when combining oxygen enrichment and exhaust gas recirculation strategies.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Yan Hua, Zhong Wang, Ruina Li, Shuai Liu, Yang Zhao, Lei Qu, Deqing Mei, Hui Lv
Summary: This study investigated the morphology, nanostructure, and oxidation reactivity of particles produced by the combustion of Fischer-Tropsch (F-T) diesel, biodiesel, and regular diesel through techniques such as HRTEM, RS, and TGA. The results showed that F-T diesel particles had smaller fractal dimension and fringe tortuosity, higher graphitization degree, and lower oxidation reactivity compared to regular diesel particles. Biodiesel particles exhibited the opposite characteristics and were more prone to oxidation. The application of exhaust gas recirculation (EGR) increased particle agglomeration, reduced graphitization degree and oxidation characteristic temperature, and enhanced particle oxidation reactivity.
Article
Energy & Fuels
Dongdong Chen, Tie Wang, Tiantian Yang, Guoxing Li, Yao Chen, Tianyou Qiao
Summary: This study investigates the application of methanol and F-T diesel in dual-fuel engines and finds that EGR improves combustion characteristics while DOC significantly reduces gaseous emissions. However, other emissions increase as the MSR and EGR rate increase. When equipped with a DOC, CO, NO, NO2, NOx, MeOH, and HCHO emissions decrease as the EGR rate increases, with the reduction rate of CO and MeOH emissions being over 99.5% and 93% respectively.
Article
Chemistry, Multidisciplinary
Mohammed A. . Fayad, Miqdam T. Chaichan, Hayder A. . Dhahad, Ahmed A. . Al-Amiery, Wan Nor Roslam Wan Isahak
Summary: This study successfully reduced the sulfur content in diesel fuel, improved engine performance, and reduced exhaust emissions by using gasoline-diesel blends and the concept of partially premixed combustion ignition. The combination of gasoline blending and fuel injection timing manipulation led to better and cleaner combustion. The use of gasoline-diesel blends and partially premixed combustion ignition resulted in a significant decrease in NOx emissions and a reduction in particle emissions.
Article
Thermodynamics
Zhen Lu, Mengyu Liu, Lei Shi, Tianyou Wang, Tianlong Lu, Huaiyin Wang
Summary: A new method called Injected Exhaust Gas Recirculation (IEGR) strategy was proposed to meet the stringent emissions legislation and higher fuel economy requirements of low-speed two-stroke marine diesel engines. Numerical investigations were conducted to examine the effects of the IEGR strategy on fuel/air mixture quality, combustion performance, and emission characteristics. The results show that the IEGR strategy can improve the in-cylinder swirl ratio and achieve EGR stratification, resulting in reduced brake specific fuel consumption (BSFC) and NOx emissions compared to the base case.
Article
Energy & Fuels
S. Rami Reddy, G. Murali, Areef Ahamad Shaik, V. Dhana Raju, M. B. S. Sreekara Reddy
Summary: The experimentation shows that using advanced fuel injection timing can significantly improve the efficiency of a diesel engine and reduce emissions, especially under full load conditions. Additionally, the addition of moderate Exhaust Gas Recirculation (EGR) can significantly reduce NOX emissions without compromising engine performance.
Article
Energy & Fuels
Sarthak Nag, Atul Dhar, Arpan Gupta
Summary: This study found that EGR has different effects on combustion during hydrogen-diesel co-combustion. With an increase in EGR, the combustion process is negatively affected at low loads, while combustion variability improves at higher loads.
Article
Thermodynamics
M. S. Gad, Zhixia He, A. S. El-Shafay, Ahmed El-Seesy
Summary: This study investigated the impact of blending mandarin essential oil with diesel fuel on engine performance under various loads and a fixed speed. Experimental results showed that adding mandarin essential oil can reduce emissions and fuel consumption, but increase NOx emissions. Simulation results indicated that the EGR approach effectively reduces NOx levels with minimal impact on soot levels.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Changming Gong, Xiankai Si, Fenghua Liu
Summary: The study found that actual EGR has a greater impact on combustion parameters, while inert gas in EGR exacerbates combustion. Spark timing has little effect on emissions at low load.
Article
Thermodynamics
Vicente Macian, Jose Manuel Lujan, Hector Climent, Julian Miguel-Garcia, Stephane Guilain, Romain Boubennec
Summary: The study investigates the impact of high-pressure exhaust gas recirculation dispersion on NOx and smoke emissions in automotive diesel engines, finding that the opacity decreases with low dispersion but dramatically increases at higher levels, with a potential 3.5% increase in fuel consumption. The exhaust gas recirculation rate varied between 4% and 25%, showing different effects on emissions and fuel consumption depending on the engine operating condition.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Energy & Fuels
Jichao Liang, Quanchang Zhang, Zheng Chen, Zunqing Zheng
Summary: The experiment investigated the effects of biodiesel and n-pentanol on a common-rail diesel engine's performance and emissions at different EGR rates. Results showed that B20P10 fuel exhibited better combustion and emission characteristics, especially at higher EGR rates, compared to other tested fuels. The addition of n-pentanol to diesel may lead to higher maximum pressure rise rate, but ternary blends can alleviate the issue without decreasing ITE significantly.
Article
Energy & Fuels
Qixin Ma, Quanchang Zhang, Zunqing Zheng
Summary: The study found that the increase in EGR rates and ethanol content in DB blends can affect combustion characteristics and emissions. Ultimately, using diesel/biodiesel/ethanol ternary fuels under medium EGR rates may be a better choice for diesel engines.
Article
Thermodynamics
Nikolaos F. Sakellaridis, Spyridon I. Raptotasios, Antonis K. Antonopoulos, Georgios C. Mavropoulos, Dimitrios T. Hountalas
Article
Environmental Sciences
Dimitrios T. Hountalas, Georgios C. Mavropoulos, Christos Katsanos, Stavros Daniolos, Iosif Dolaptzis, Nikolaos Mastorakis
INTERNATIONAL JOURNAL OF GLOBAL WARMING
(2016)
Article
Thermodynamics
Constantine D. Rakopoulos, Dimitrios C. Rakopoulos, George C. Mavropoulos, George M. Kosmadakis
Article
Energy & Fuels
G. C. Mavropoulos
Article
Thermodynamics
S. Mavridou, G. C. Mavropoulos, D. Bouris, D. T. Hountalas, G. Bergeles
APPLIED THERMAL ENGINEERING
(2010)
Article
Thermodynamics
C. D. Rakopoulos, G. C. Mavropoulos
Article
Thermodynamics
Dimitrios T. Hountalas, Georgios C. Mavropoulos, Christos Katsanos, Walter Knecht
ENERGY CONVERSION AND MANAGEMENT
(2012)
Article
Engineering, Mechanical
C. D. Rakopoulos, G. C. Mavropoulos
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2009)
Article
Engineering, Mechanical
G. C. Mavropoulos, C. D. Rakopoulos, D. T. Hountalas
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2011)
Article
Thermodynamics
Constantine D. Rakopoulos, Dimitrios C. Rakopoulos, Dimitrios C. Kyritsis, Eleftherios C. Andritsakis, George C. Mavropoulos
Summary: This study is based on a validated combustion model and predicts the performance and emissions of spark-ignition engines. The model is extended by considering exergy terms and applied to experimental test results. The study provides detailed information on chemical exergy, irreversibility, and exergy losses.
Article
Energy & Fuels
Vasileios Georgitzikis, Dionisis Pettas, Konstantinos Loukas, Georgios Mavropoulos
Summary: This paper introduces a new engine kinematic mechanism as a potential replacement for the traditional crankshaft mechanism. The initial experimental results show that the new engine has promising prospects, particularly in hybrid automotive applications.
Proceedings Paper
Transportation
Dimitrios T. Hountalas, Christos Katsanos, Georgios C. Mavropoulos
TRANSPORT RESEARCH ARENA 2012
(2012)
Article
Transportation Science & Technology
G. C. Mavropoulos, C. D. Rakopoulos, D. T. Hountalas
SAE INTERNATIONAL JOURNAL OF ENGINES
(2009)
Article
Thermodynamics
DT Hountalas, GC Mavropoulos, G Kourbetis
ENERGY CONVERSION AND MANAGEMENT
(2006)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
